function plot(x, y; style="solid", width=1, color="black")
    println("x=",x, "|y=", y, "|style=", style, "|width=", width, "|color=", color);
end

plot(3, 5, width=2,style="sss")

#######执行效率测试
function sumfor()
    x=0
    for i in 1:10^8
        x+=i
    end
    x
end
@time sumfor()
@time sumfor()

x=0
@time for i in 1:10^8
    global x+=i #效率低下
end
#######执行效率测试 end
